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GTS 207 has lost speed over the season

Chris112790

Well-Known Member
Messages
15
Reaction score
2
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Location
Lore City, Ohio
Boat Make
Glastron
Year
2016
Boat Model
GTS
Boat Length
21
I have had my 207 docked at the marina all summer, and am now topping out at around 30 mph at full throttle with just 2 people onboard. There is a decent amount of build-up/grime on the bottom of the boat - is it logical to think that is causing the issue?
 

genwrx

Jet Boat Lover
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93
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Location
Houston, Tx
Boat Make
Glastron
Year
2016
Boat Model
GTS
Boat Length
21
Yeah could be a good place to start, I'd get it on the trailer or lift and get it scrubbed clean and check the intake grate as well.
 

Bill D

Jetboaters Admiral
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Location
Tuscaloosa, AL
Boat Make
Yamaha
Year
2011
Boat Model
Limited S
Boat Length
24
Some members have seen 10-15 MPH loss from growth on the hull.
 

Scarabpaul

Jet Boat Addict
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Location
Bradford, Ontario, Canada
Boat Make
Scarab
Year
2015
Boat Model
Other
Boat Length
21
you may also have a damaged wear ring or impeller, that would cause cavitation and loss of top speed... I would pull the boat out and inspect like genwrx suggested.
 

Shuck Water

Jetboaters Commander
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Location
Frisco, TX
Boat Make
Yamaha
Year
2012
Boat Model
Limited S
Boat Length
24
It's the grime. Doesn't take much at all to kill top end speed.
 

Chris112790

Well-Known Member
Messages
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Reaction score
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Location
Lore City, Ohio
Boat Make
Glastron
Year
2016
Boat Model
GTS
Boat Length
21
Thanks guys. I pulled the boat yesterday and plan to give it a good clean/inspection today before the weekend. A lot of people have told Simple Green works great to clean the scum off the boat... has anyone used it?
 

Chris112790

Well-Known Member
Messages
15
Reaction score
2
Points
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Location
Lore City, Ohio
Boat Make
Glastron
Year
2016
Boat Model
GTS
Boat Length
21
you may also have a damaged wear ring or impeller, that would cause cavitation and loss of top speed... I would pull the boat out and inspect like genwrx suggested.
I hope it's nothing that serious -obviously. I haven't done much with it this year only been out a few times, but each time I took it out it seemed to get slower. Hoping it's just the progressive build up.
 

Noel Cain

Active Member
Messages
9
Reaction score
1
Points
40
Boat Make
Glastron
Year
2016
Boat Model
GTS
Boat Length
19
Any update. I am having the same issue now, but dont see any build up at all. It runs full throttle when i first start it up, hits around 40mph, then the boat automatically cuts back power to run at 30mph only at full throttle. I have to turn off engine, then on again and same thing happens. Check engine light is only on at the power ignition, then goes away when its running. Super confused.
 
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